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Derivative Financial Instruments (Summary Of Derivative Instruments Designated As Hedging Instruments) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Fair Value $ 61 $ 30
Notional Amount $ 150,000 150,000
Interest Rate Cap [Member]    
Derivative [Line Items]    
Interest Rate Strike 4.00%  
August 2021 Term Loan [Member] | Interest Rate Cap, Maturity Date April 1, 2019 [Member]    
Derivative [Line Items]    
Effective Date Sep. 01, 2015  
Maturity Date Apr. 01, 2019  
Interest Rate Strike 4.00%  
Fair Value   1
Notional Amount $ 50,000 50,000
January 2022 Term Loan [Member] | Interest Rate Cap, Maturity Date May 1, 2021 [Member]    
Derivative [Line Items]    
Effective Date Dec. 01, 2014  
Maturity Date May 01, 2021  
Interest Rate Strike 4.00%  
Fair Value $ 57 26
Notional Amount $ 50,000 50,000
January 2022 Term Loan [Member] | Interest Rate Cap, Maturity Date February 3, 2020 [Member]    
Derivative [Line Items]    
Effective Date Sep. 01, 2015  
Maturity Date Feb. 03, 2020  
Interest Rate Strike 4.00%  
Fair Value $ 4 3
Notional Amount $ 50,000 $ 50,000